RuleObjectExistsAttribute(String, String, String) Constructor

Initializes a new instance of the RuleObjectExistsAttribute class.

Namespace: DevExpress.Persistent.Validation

Assembly: DevExpress.Persistent.Base.v24.1.dll

NuGet Package: DevExpress.Persistent.Base

Declaration

C#

public RuleObjectExistsAttribute(
    string id,
    string targetContextIDs,
    string criteria
)

VB.NET

Public Sub New(
    id As String,
    targetContextIDs As String,
    criteria As String
)

Parameters

Name	Type	Description
id	String	A string value representing the current rule identifier. You can pass an empty value as the id parameter. An appropriate identifier will begenerated automatically, and set for the ID property of the Validation | Rules | Rule node in the Application Model.
targetContextIDs	String	A string value that specifies a list of identifiers of the contexts when the current rule should be checked. This value is set for the RuleBaseAttribute.TargetContextIDs property.
criteria	String	A string value representing the criteria that must be satisfied by the target type objects.

Remarks

If you are going to set a custom message template instead of a default one, use a constructor with the messageTemplate parameter.

The common rules of writing a criteria are described in the Ways to Build Criteria topic. In addition, you can use the following construction: PropertyName = '@PropertyName' (the operator is optional). @PropertyName represents a parameter that is set to the value of the PropertyName property of the currently validated object, when the rule is checked.